AutoCodes – Cadillac – U2608 Cadillac

U2608 Cadillac Code - Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U2608 Cadillac indicates Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module.
Common causes: Common causes include Faulty Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 607

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 18, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U2608 Cadillac Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device.
This diagnostic is used to check the loss of communication with the Hybrid/EV Powertrain Control Module on a high-speed General Motors Local Area Network (GMLAN) bus. The Battery Energy Control Module supervises a periodic serial data message to check the communication status of the Hybrid/EV Powertrain Control Module. If this message is not received within 400 ms, the Battery Energy Control Module increases its fail count. When this fail count is over X Cal Value (7) during Y Cal Value (10 samples), the diagnostic status of this code is set to Failed and transmitted over high voltage energy high-speed GMLAN bus to the Hybrid/EV Powertrain Control Module.
The Diagnostic Trouble Code (DTC) will set when a supervised periodic message that includes the transmitter device availability has not been received within 400 ms.

OBDII Code U2608 Cadillac - Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module - AutoCodes.com — U2608 Cadillac Code - Electric A/C Compressor Control Module Lost Communication With Hybrid/EV Powertrain Control Module

What does this mean?

What are the Possible Causes of the DTC U2608 Cadillac?

Faulty Hybrid/EV Powertrain Control Module
Hybrid/EV Powertrain Control Module harness is open or shorted
Hybrid/EV Powertrain Control Module circuit poor electrical connection
Faulty Electric A/C Compressor Control Module

How to Fix the DTC U2608 Cadillac?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U2608 Cadillac code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U2608 Cadillac Code

1. What are the common symptoms of OBDII code U2608 in a Cadillac related to Electric A/C Compressor Control Module communication loss?

- Common symptoms include loss of air conditioning functionality, erratic compressor operation, and potential issues with hybrid/EV powertrain performance.

2. What are the possible causes for OBDII code U2608 in a Cadillac indicating a communication problem between the Electric A/C Compressor Control Module and Hybrid/EV Powertrain Control Module?

- Causes may include faulty wiring or connectors, a malfunctioning control module, software issues, or communication network failures within the vehicle.

3. How can I diagnose OBDII code U2608 in my Cadillac related to the Electric A/C Compressor Control Module communication error?

- Diagnosis involves using a professional OBDII scanner to retrieve the code, checking for any related codes, inspecting wiring and connectors for damage, and verifying the communication signals between modules.

4. What are some repair tips for addressing OBDII code U2608 in a Cadillac with Electric A/C Compressor Control Module communication issues?

- Repair tips may include repairing or replacing damaged wiring and connectors, updating control module software if applicable, and ensuring proper communication network functionality within the vehicle.

5. Can OBDII code U2608 in a Cadillac related to Electric A/C Compressor Control Module communication loss be fixed without professional help?

- While some basic checks like inspecting wiring connections can be done by DIY enthusiasts, resolving the code may often require professional diagnostic tools and expertise.

6. Is it safe to continue driving a Cadillac with OBDII code U2608 indicating a communication problem between the Electric A/C Compressor Control Module and Hybrid/EV Powertrain Control Module?

- It is not recommended to drive the vehicle extensively with this code unresolved, as it may lead to further issues with the air conditioning system and potentially impact the hybrid/EV powertrain operation.

7. How much does it typically cost to repair OBDII code U2608 in a Cadillac associated with the Electric A/C Compressor Control Module communication issue?

- Repair costs can vary depending on the specific cause of the problem, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Are there any recalls or technical service bulletins related to OBDII code U2608 in Cadillacs with issues regarding the Electric A/C Compressor Control Module communication?

- It is recommended to check with a Cadillac dealership or online resources for any relevant recalls or technical service bulletins addressing this specific OBDII code and related concerns.

9. Will resetting the OBDII code U2608 in my Cadillac temporarily solve the Electric A/C Compressor Control Module communication problem?

- Resetting the code may temporarily clear the warning light, but if the underlying issue causing the communication problem persists, the code is likely to reappear after some driving cycles.

10. Can the Electric A/C Compressor Control Module communication issue causing OBDII code U2608 in a Cadillac be prevented with regular maintenance?

- Regular vehicle inspections and maintenance, including checking for wiring integrity and keeping software up to date, can help prevent issues leading to communication problems between control modules.